<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
	<script type="text/javascript">
	
		//左查询  对等号左侧的变量进行查询
		
		test()
		function test(){
			var a=8;
			b=a;
			console.log(b);
		}
		
		//右查询  等号的非左侧
//		console.log(b);
	</script>
</html>
